In our band we used the Korg ih Vocal Harmonizer for a looooong time, but last week I checked the new TC-Helicon VoiceWorks and am very impressed by its sound/features.
This is why I purchased the VoiceWorks and .... amazing !
Please check
http://www.tc-helicon.tc/Default.asp?Id=1688 All what I want is in this machine :
HiQ mic-amp with phantom
4-voice harmony,
effects as reverb, delay etc.
EQ and dynamics on both lead and harmony,
Voice 'thickening',
vibrato, breath etc.,
100 programmable presets, song mode,
and pitch-correction (As the Intonator)
I think it is much better than the VoicePrism that I tested a few years ago.
Roel